By Giovanni Legorano and Giada Zampano

Prosecutors from a small town in the south of Italy have launched an investigation into several Italian banks in connection with derivatives transactions, a person close to the investigation told Dow Jones Newswires Friday.

The person said prosecutors from Trani are investigating the sale of derivatives to business and private clients by some "main Italian banks," adding that they are investigating allegations of swindling--to cheat or defraud of money or property--and usury--lending money at excessive or abusive interest rates. These two crimes would have damaged the counterparties of the derivatives contracts in question.

Following news of the investigation, which was reported in the Italian media, the shares of a number of Italian banks lost ground in Friday trading in Milan.

Italian daily Corriere della Sera reports on its website that Trani prosecutors are investigating employees of five Italian banks--UniCredit SpA (UCG,MI), Intesa Sanpaolo SpA (ISP.MI), Banca Monte dei Paschi di Siena SpA (BMPS.MI), Banca Nazionale del Lavoro and Credito Emiliano SpA (CE.MI)--in connection with the sale of derivatives to entrepreneurs from the city of Bari.

At 1514 GMT, UniCredit shares were down 2.8%, Intesa was down 2.5%, Monte dei Paschi was down 6.3% and Credito Emiliano was down 1.7%.

Monte dei Paschi took several hits in most of the last trading sessions after it emerged last week that complex structured transactions might cause it millions in losses. The Trani investigation doesn't involve one of those transactions.

A spokeswoman for UniCredit said at the moment, the bank isn't aware of an investigations by Trani prosecutors. Monte dei Paschi declined to comment.

Credito Emiliano, Intesa and Banca Nazionale del Lavoro didn't immediately return calls seeking comment.

(Manuela Mesco and Oscar Bodini contributed to this report)

Write to Giovanni Legorano at giovanni.legorano@dowjones.com

Subscribe to WSJ: http://online.wsj.com?mod=djnwires

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